/* whotofile.c
 * purpose: show how to redirect output for another program
 *	idea: fork, then in the child, redirect output, then exec
 */
#include	<stdio.h>
#include	<stdlib.h>

int main()
{
	int	pid;
	int	fd;
	printf("About to run who into a file\n");

	/* create a new process or quit */
	if ((pid = fork()) == -1)
	{
		perror("fork");exit(1);
	}

	/* child does the work */
	if (pid == 0)
	{
		close(1);						/* close, */
		fd = creat("userlist", 0644);				/* then open */
		execlp("who", "who", NULL);				/* and run */
		perror("execlp");
		exit(1);
	}

	/* parent waits then reports */
	if (pid != 0)
	{
		wait(NULL);
		printf("Done running who. results in userlist\n");
	}
}
